Whatever works.... Just make sure it's sharp. Biggest binds I have seen are people having to fight to get the knife in. Length does not help on a dull knife. A sharp knife, you just cut a gash, and slide in deeper.
When I've had to kill them because we could not just release them, a good sharp knife of almost any size works. I have to admit, I've killed several with the disposable snap off blade razor knives that you get at the local hardware store. They weigh nothing, and they are easy enough to keep sharpened. Just install a new blade. A verticle slice by the lung and he's down for the count. I hate a regular fixed blade handle sticking me in the side while I'm moving through the thick brush. It gets old quick. Plus, I'm always feeling to make sure a good knive has not fallen out of the sheath. I've got a truck door pocket full of hog stickers, but most have more dust than blood on them.
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